In these circumstances, the best thing you can do is create a copy of your tree to protect it. You could download it as a Dynamic HTML file and keep it on your computer. Or you could download it as FamilyScript or GEDCOM which you can then import back into Family Echo, creating a new version of your tree which you could save to an account that no one has access to.
It may be better to share the family tree, but ask people to create their own accounts. That way, if they accidentally click 'Remove' it just removes the tree from their account, and not yours.